Question

A transformer core is laminated to
(A) Reduce hysteresis loss
(B) Reduce eddy current loss
(C) Reduce copper loss
(D) Reduce all of the above loss

Answer 1

Hint We are asked indirectly about the benefit of the core of a transformer. Thus,We will take into account the concept of how a transformer works. Then we will discuss how the lamination of the core helps in his work.

Complete Step By Step Solution
A transformer works on the principle of electromagnetic induction. There is a primary coil in the transformer through which an alternating current is passed. Due to this the coil produces a fluctuating magnetic field and due to this, the magnetic flux attached to the secondary coil changes continuously inducing current in it.
The advantage of it is that a high current can be produced from a small amount of alternating current and vise-versa.
Now,
Eddy current is the surface current induced when the magnetic flux attached to the surface changes regularly. Now, if the core is not laminated, then the net current output of the transformer reduces as the eddy current loss. But if it is laminated, then this problem will never arise in it.
Again,
Hysteresis is the loss of energy in the form of heat. If the core is not laminated, then due to the change in magnetic flux, here is some heat generated in the core. But due to the lack of lamination, the heat can be easily dissipated. But, if the core is laminated, then the energy is not lost due to hysteresis.
Thus,

The answer is (A) and (B).

Note We can say that the lamination of the core is a very essential part in the working of the transformer. Thus it is important to laminate the core of the transformer.